Dunwich, Britain's Atlantis

The account

Dunwich was one of the great ports of medieval England, eight churches, a mint, a fleet. The storms of 1286 and 1347 ate the coast from under it, street by street, until the last tower went over the cliff. The city lies just offshore in water like cold tea; sonar has mapped its ruins where divers' eyes are useless. Locals say you can hear the bells under the waves. The sonar, less romantic, found the church towers.

Leads, where the trail points now

• Pin down the most specific last-known position in the record before going; the search centers on Off Dunwich, Suffolk, England.
• What you are chasing is A drowned medieval city the size of old London. Work the documented record of Dunwich, Britain's Atlantis back to primary sources and separate what is attested from folklore.
• Protected wreck-and-ruin field, survey diving by arrangement; the seabed is mapped by acoustics, not by hand.